Avoid 6600 - Batch 7638A742

**The Asgard** · 03-19-2007, 05:11 AM

Just a word to the wise for people that have access to chips based on batch codes. Avoid 7638A742 like the plague. Worst C2D chips I have ever come across. Failing Orthos with 1.45 on the core at 2.7G's and will not boot at 400FSB with any amount of voltage.

**eva2000** · 03-19-2007, 05:17 AM

similar but a bit better is Jammer's Xeon 3060 with 7638A563 with 3.4ghz at 1.42v http://i4memory.com/showthread.php?t=3771

**The Viper** · 03-19-2007, 05:20 AM

Holy Crap thats terrible

**dinos22** · 03-19-2007, 05:21 AM

considering those other clocks i've seen from the OP i can certainly say there is no user error with those clocks................oh boy lucky i didn't jump blindly on the whole Xeon bandwagon

**alpha0ne** · 03-19-2007, 05:38 AM

Originally Posted by dinos22

considering those other clocks i've seen from the OP i can certainly say there is no user error with those clocks................oh boy lucky i didn't jump blindly on the whole Xeon bandwagon

It crossed my mind more than once to 'give em ago' when Jammer was waiting for his Xeon

**irev210** · 03-19-2007, 06:51 AM

also avoid L631A

does better though, hits 3GHz, still crap though.

**itznfb** · 03-19-2007, 06:54 AM

agreed. i had several 28A's, all sucked. highest was 3.3ghz stable. highest benchable was 3.76ghz. my 29F's are even worse =\

**Yoxxy** · 03-19-2007, 07:01 AM

26a, 32a Ftw.

**The Asgard** · 03-19-2007, 07:59 AM

Currently using a 629B. I have had access to a fair few 6600's (100+) and always check them to see how they clock. The current trend seems to be that the newer chips are getting worse for overclocking ability. Just thought I would give you the heads up.

Maybe Intel are getting wise

**eva2000** · 03-19-2007, 08:04 AM

Originally Posted by The Asgard

Currently using a 629B. I have had access to a fair few 6600's (100+) and always check them to see how they clock. The current trend seems to be that the newer chips are getting worse for overclocking ability. Just thought I would give you the heads up.

Maybe Intel are getting wise

probably better chips moving to E6700 model

**bench261** · 03-19-2007, 08:37 AM

Originally Posted by irev210

also avoid L631A

does better though, hits 3GHz, still crap though.

i have an l631a, i haven't really tested it at all cuz the temps get really high fast at stock cooling just browsing online at 3.8ghz. not stable stress testing at 3.6ghz. i cant get any higher as it seems im limited to 420-425 fsb. its either the cpu or mobo. once i get watercooling ill find out

**nn_step** · 03-19-2007, 08:42 AM

sounds like they are remaking the Layout for higher yields.

**Ten** · 03-19-2007, 09:04 AM

hmm i have an E6600 7638A739 runs stabel 3,6 @ 1.52v. And it runs quite cool to ~50 @ orthos small fft. I must be lucky then

**Knight** · 03-19-2007, 09:10 AM

Originally Posted by nn_step

sounds like they are remaking the Layout for higher yields.

Can you explain that?

**agenda2005** · 03-19-2007, 09:16 AM

My 2 cent is that you should also avoid anything with F. The one I have keep failing Orthos at 3.24GHZ no matter what kind of Vcore voltage set.

**nn_step** · 03-19-2007, 09:29 AM

Originally Posted by Knight

Can you explain that?

they care about Profit but not Overclockers.

**rithina** · 03-19-2007, 09:33 AM

My 30F is the best.. out of 4 6600 i used...26A, 32B, 33F, 29A..
1.5v DMM measured to run at 3.6mhz prime stable

**Tibu** · 03-19-2007, 09:34 AM

Originally Posted by nn_step

they care about Profit but not Overclockers.

That is the point of any private enterprise/company.

**kiwi** · 03-19-2007, 09:38 AM

Might be, however 7638A742 is fine, 3.6 1.5V stable and 3.9 1.65V benchable on air.

F are not bad either, I had L628F 6300, hit 3.4GHz stable and L638F 6300 which hit 3.6Ghz stable at ~1.5V

Bs are the best, the only problem they heat up more

**nn_step** · 03-19-2007, 09:39 AM

Originally Posted by Tibu

That is the point of any private enterprise/company.

absolutely remember winchestor?
They used to be great then CBBID came out and it sucked

**ChaosMinionX** · 03-19-2007, 10:13 AM

My Xeon in my sig will run 3.6ghz on 1.4250 to make it stable in orthos, will boot 1.375 though.

**Patriote** · 03-19-2007, 10:38 AM

Hey Guys,

sorry to spam the thread but there is a good friend that have that 6600 L631b120 and i'd like to know if it's a good clocker.

What can i expect from that chip ?

PS: It'll be hooked under watercooling.

Thanks a lot!

EDIT: Did a few research and found out that these chips Oc pretty well and it's lapped

**J@mmer** · 03-19-2007, 12:43 PM

Yep agreed guys! It seems the Xeon's made in the Philipines suck! Mine however is still ORTHOS stable at around 3400 to 3480 but yes they are terrible clockers compared to other Xeons out there.

**barrymaldon** · 03-19-2007, 12:49 PM

I've got a 28a and it'll boot into windows at the max fsb my board will do 9*455 on water

**iviustang50h** · 03-19-2007, 01:49 PM

My L640A820 overclocks like crap as well. I wish I would have know that they are getting worse as time went on. It's too late to RMA it now.

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